1.

An echo is returned in 6 seconds. What is the distance of reflecting surface? from source? [Given that speed of sound is 342 m/s.]

Answer» GIVEN..
TIME in which echo RETURNED t=6s.
speed of sound v=342m/s.
distance=speed*time=342*6=2052m.
As this distance is twice the distance of reflecting SURFACE from source.
so,
the distance of REFLECT surface=2052/2=1026m


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